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H-Clad KiwiTEC Larch Vertical Shiplap Weatherboards
Description

HTL's H-Clad KiwiTEC Vertical Shiplap Weatherboards are a vertical cladding best suited for light commercial and residential buildings. Made from durable and sustainable NZ Larch, this provides long-lasting exteriors with minimal maintenance and maximum protection against moisture and weather damage. Larch is pale yellow, almost white in colour with clearly marked tight rings and a smooth surface for a beachy aesthetic and striking stain application.

The Vertical Shiplap system is a first and second line of defence against water penetration by separating the cladding from the external wall frame with a drained cavity, or using direct fix installation.

The weatherboards are pre-finished with two coats of DRYDEN WoodOil. 

Vertical Shiplap is available in the following profiles options, along with a range of exterior mouldings. 

  • HTL51 — Vertical Shiplap 6mm V Detail 110mm Cover
  • HTL52 — Vertical Shiplap 6mm V Detail 165mm Cover
  • HTL53 — Vertical Shiplap Double Wide V Detail 110mm Cover
  • HTL54 — Vertical Shiplap Double 6mm V Detail 165mm Cover
  • HTL55 — Vertical Shiplap 6mm Square Detail 110mm Cover
  • HTL56 — Vertical Shiplap 6mm Square Detail 165mm Cover
  • HTL58 — Vertical Shiplap Double 6mm Square Detail 110 Cover
  • HTL59 — Vertical Shiplap Double 6mm Square Detail 165mm Cover
  • HTLVS1 — Vertical Shiplap 35° Bevel 115mm Cover
  • HTLVS2 — Vertical Shiplap 45° Bevel 115mm Cover
  • HTLVS3 — Vertical Shiplap 70° Bevel 115mm Cover
  • HTLVS4 — Vertical Shiplap 10mm Negative Square Detail with 6.5mm Radius Round 110mm Cover
  • HTLVS5 - HTLVS9 — Vertical Shiplap 165mm Cover
  • HTLVS10 - HTLVS15 — Vertical Shiplap 110mm Cover
Key Features

Larch cladding offers architects a sustainable, durable, and versatile solution for both commercial and residential projects. Its natural and environmental benefits, coupled with the advanced design of the HTL cladding system, make it a superior choice for contemporary building needs.

  • Larch is pale yellow, almost white in colour with clearly marked tight annual rings. This wood is straight-grained and contains tight knots with a fine smooth surface, a striking pattern often sought after and without stain it can achieve a grey-weathered beachy aesthetic but receives stain well to accentuate the grain
  • It is classed as a softwood, but one of the harder softwoods available
  • Breathable and a natural insulator: while absorbing the heat from the sun while maintaining waterproof properties
  • Chemical-free and Naturally Durable: Larch cladding is inherently durable due to the wood's natural resistance to decay and pests. It eliminates the need for chemical treatments, providing an environmentally safe and health-conscious building material.
  • Sustainable and Renewable Resource: Larch is sourced from sustainably managed forests, ensuring a renewable supply. This aligns with sustainable building practices and reduces environmental impact.
  • NZ Grown: Locally grown in New Zealand, Larch supports reducing the carbon footprint associated with imported materials.
  • Carbon Sequestering: Larch absorbs carbon dioxide, aiding in carbon reduction efforts. When used as cladding, this carbon remains sequestered, contributing to long-term environmental benefits.
  • Dual Defence Against Water Penetration: The H-Clad KiwiTEC Shiplap Vertical cladding system employs a dual-layer defence by incorporating a minimum 18mm drained cavity between the cladding and the external wall frame. This ensures optimal water drainage and mitigates the risk of water infiltration, preserving the building's structural integrity.
  • Versatile Application for Various Building Types: H-Clad KiwiTEC Shiplap Vertical are engineered for both light commercial and residential buildings, providing a versatile and reliable cladding solution suitable for diverse architectural projects.
  • Variety of Finishes: Band Sawn Face (BSF) and Dressed Face (DF): The H-Clad Shiplap Vertical is available in two distinct finishes. The Band Sawn Face (BSF) offers enhanced durability due to its textured surface, while the Dressed Face (DF) provides a smooth, refined appearance, catering to aesthetic and functional preferences.
  • Exceeds 15 year Minimum Durability Requirement: When installed above ground, H-Clad KiwiTEC Shiplap Vertical surpasses the 15 year minimum durability requirement, ensuring long-term performance and reliability.
  • Enhanced Protection with DRYDEN WoodOil: H-Clad products treated with DRYDEN WoodOil benefit from a water-repellent, non-filming, and deeply penetrating timber protector. This treatment maximises the natural resilience of Larch, maintaining its structural integrity and visual appeal over time.
NZ Made
NZ Made
Scope of Use
  • Cavity or Direct Fix

H-Clad KiwiTEC Shiplap Vertical are suitable as a vertical external fixed wall cladding, meet the requirements and limitations of the following:

  • NZBC Acceptable System — E2/AS1, Paragraph 1.1
  • Timber framing compliant with NZS 3604:2011
  • Risk score of 0-20 calculated from NZBC Acceptable Solution E2/AS1, Table 2; and,
  • NZS 3604:2011, Sec5.2 Wind Zones, including 'Very High'
  • All materials and processes contained in the NZS 3604:2011 building scope 

All HTL H-Clad Weatherboards meet the requirements of the NZ Building Code for Clauses B1 Structure, B2 Durability and E2 Exterior Moisture when installed in accordance with the HTL installation guide.

Limitations on Use

H-Clad KiwiTEC Vertical Shiplap must be designed and installed in accordance with the HTL Vertical Shiplap Technical Guide for Specifiers and Installers.

H-Clad KiwiTEC is manufactured with care and inspected to ensure quality. However, it is a natural wood product and subject to variations in weight, density, colour, grain and performance. Care must be taken in installation and maintenance to allow for movement.

Storage and Handling

Care must be taken to ensure that timber and accessories are kept clean and dry, and are not damaged whilst in storage awaiting application. Extra care is to be taken while handling timber to ensure that they are not damaged. Timber is to be stacked on flat level bearers that are a maximum of 900mm apart and at least 100mm off the ground.

Timber should either be stored inside an enclosed building or covered and protected from the elements when stored outside

Important: Timber weatherboards should not be installed if their moisture content is outside the range of 14 - 18 %

Coating Requirements

It is not recommended that HTL weatherboards be left uncoated.

HTL recommends that all timber H-clad cladding should be envelope coated before installation, including all cut ends and exposed fresh timber. Avoid coating the top surface only, once installed as this will likely cause movement (cupping) in the timber surface.

HTL do not recommend the use of dark paints or coatings as this may accentuate movement and splitting of the timber, especially if it is exposed to the sun or hot temperatures.  Timber generally requires a coating with a Light Reflective Value (LRV) of 40% or greater to minimise the amount of heat build-up in the timber and the resultant thermal movement.  (NB: Black ≈ 5% & White ≈ 95%)

Dryden WoodOil Note:

  • For fire rating — Two coats of Dryden WoodOil coated on 18.5mm Western Red Cedar as Group 3 (NZBC) Test Report 7-599140-CO
  • Light Reflective Values (LRV) — LRV cannot be determined for semi-transparent coatings, as the colour of the timber coated and the number of coats applied impacts measured LRV.
Statement of Building Code Compliance

When designed, installed and maintained in strict accordance with the HTL Vertical Shiplap Technical Guide for Specifiers and Installers, the H-Clad KiwiTEC Vertical Weatherboard Drained Cavity System complies with the following clauses of the New Zealand Building Code for cladding in residential and light commercial buildings within the scope of NZS 3604. 

  • Clause B1 — Structure: Meets the requirements for loads arising from self weight, wind and impact.
  • Clause B2 — Durability: Meets requirements for Performance B2 3.1 (b) ,15 years and B2.3.2.
  • Clause E2 — External Moisture: Performance E.3.2.

The H-Clad KiwiTEC Vertical Weatherboard Drained Cavity System is an Alternative Solution and has been tested in an appropriately certified test facility and has shown to meet the requirements of E2/VM1 using the details and materials prescribed in the Technical Guide.

In-Service History

HTL H-Clad KiwiTEC Larch Weatherboards are manufactured from New Zealand Larch (Larix Decidua) and comply with NZS 3602:2003; Table 2:2A1-Species. Weatherboards are supplied in Dressing Heart Grade (NZS 3602:2003; Table 2:2A1-Grade) with varying knot types.

H-Clad KiwiTEC Vertical Shiplap Weatherboards are supplied dry, with moisture content at 16% or less (see NZS 3602:2003, Table 2:2A1-Moisture).

Other Performance Attributes

HTL NZ Macrocarpa Weatherboards are manufactured from New Zealand Macrocarpa (hesperocyparis macrocarpa since October 2013 (previously cupressus macrocarpa)) and comply with NZS 3602:2003; Table 2:2A1-Species. Weatherboards are supplied in Dressing Heart Grade (NZS 3602:2003; Table 2:2A1-Grade) which comprises of Heartwood with sound tight knot

HTL H-Clad KiwiTEC Vertical Shiplap Weatherboards are supplied dry, moisture content at 18% or less (see NZS 3602:2003, Table 2:2A1-Moisture).

Documents
HTL Technical Guide for Specifiers & Installers — Vertical Shiplap

2023

Species Data Sheet: Larch
Timber Care Guide: Weatherboards

v1.0 June 2024

HTL Product Guidebook — H-Clad Section

2024

H-Clad Cladding Profiles
H-Clad Vertical Profiles
H-Clad Vertical Shiplap Profile Renders
Dryden WoodOil Data Sheet
CAD/PDF Details
HTL51: Vertical Shiplap 6mm V Detail 110mm Cover

HTL51

HTL52: Vertical Shiplap 6mm V Detail 165mm Cover

HTL52

HTL53: Vertical Shiplap Double Wide V Detail 110mm Cover

HTL53

HTL54: Vertical Shiplap Double 6mm V Detail 165mm Cover

HTL54

HTL55: Vertical Shiplap 6mm Square Detail 110mm Cover

HTL55

HTL56: Vertical Shiplap 6mm Square Detail 165mm Cover

HTL56

HTL58: Vertical Shiplap Double 6mm Square Detail 110 Cover

HTL58

HTL59: Vertical Shiplap Double 6mm Square Detail 165mm Cover

HTL59

HTLVS1: Vertical Shiplap 35° Bevel 115mm Cover

HTLVS01

HTLVS2: Vertical Shiplap 45° Bevel 115mm Cover

HTLVS02

HTLVS3: Vertical Shiplap 70° Bevel 115mm Cover

HTLVS03

HTLVS4: Vertical Shiplap 10mm Negative Square Detail with 6.5mm Radius Round 110mm Cover

HTLVS04

HTLVS5: Vertical Shiplap 5mm Negative 35° Bevel Detail165mm Cover

HTLVS05

HTLVS6: Vertical Shiplap 45° Bevel 165mm Cover

HTLVS06

HTLVS7: Vertical Shiplap 70° Bevel 165mm Cover

HTLVS07

HTLVS8: Vertical Shiplap 5mm Negative Square Bottom Detail with 30° Bevel 165mm Cover

HTLVS08

HTLVS9: Vertical Shiplap 10mm Negative Square Detail 165mm Cover

HTLVS09

HTLVS10: Vertical Shiplap 10mm Negative Square Detail 110mm Cover

HTLVS10

HTLVS12: Vertical Shiplap 10mm Negative Square Detail 110mm Cover

HTLVS12

HTLVS14: Vertical Shiplap 5mm Negative 70° Bevel Detail 110mm Cover

HTLVS14

HTLVS15: Vertical Shiplap 5mm Negative 70° Bevel Detail 110mm Cover

HTLVS15

Installation Details
Installation Details: Vertical Shiplap Direct Fix — Flexible Underlay
Installation Details: Vertical Shiplap on Cavity Batten — Flexible Underlay

Specialised New Zealand timber cladding for residential and commercial projects.

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